Masterson also hit two batters in the hitless performance but has extended his scoreless streak to eight innings this spring while allowing only four hits and two walks to go with six strikeouts.
After the game, manager Terry Francona named Masterson the team's opening-day starter, which will be the third straight opening-day assignment for the right-hander.
Peguero first started feeling the effects of the injury four days ago during batting practice. He is 4 for 15 in six games this spring.
Gray was touched up for four runs in one inning of work in his previous outing but came through win a fantastic rebound performance in his third spring start. He owns a 5.14 ERA and 4:2 K:BB ratio through seven spring innings.
It was Kennedy's second straight mediocre effort after throwing two scoreless innings in his spring debut. He opened up the game by serving up two doubles before A's infielder Jed Lowrie smacked a home run to put the A's up 3-0. Kennedy settled down and pitched reasonably well the rest of the way. He's looking to improve upon last year's 10-start debut with the Padres, in which he went 4-2 with a 4.24 ERA, 1.34 WHIP and 55:25 K:BB ratio in 57 1/3 innings.
Marshall has been participating in a throwing program but has yet to take the mound this spring. "He's feeling great but with his history and the shoulder from last year and not feeling great here early in camp, we are going to go on the ultra-conservative side and just make sure he does everything in his throwing protocol to verify that he's feeling great and then get him back on the mound," manager Bryan Price told MLB.com. "He's not starting from square one. He threw all offseason and threw a handful of bullpens before he got here and three or four bullpens while he was here. He's more advanced than somebody that had to completely shut down for three or four weeks."
Marshall, who has been dealing with shoulder tightness this spring, was only able to pitch 10 1/3 innings with the Reds last season.
Cowart, who is one of the top prospects in the organization, went 1 for 7 with one walk this spring. Bandy went 1 for 3 with a home run, Stamets went hitless in three at-bats and Yarbrough went 2 for 5 and scored a run.
Cahill suffered the injury in a collision at first base Tuesday. He allowed five earned runs in 4 2/3 innings in the outing and owns a 9.82 ERA through three appearances this spring.
Rasmus expects to play again Tuesday afternoon but knows it's important to not overdo it. "Just get back into my normal routine, what I've been doing and getting to do my normal stuff will get me right back," Rasmus told MLB.com. "I'll be fine, I'm not worried about it. "We have 162 games to play, you're going to have some bumps in the road at the beginning, middle and all the way through. For me, just keep my legs under me, keep my body right. Just relax, take my time, get to feeling good, get the body feeling good and we'll go from there."
Rasmus hadn't played since Feb. 28 due to a sore neck but was cleared for action earlier this week.
Jackson has shown versatility in the infield this spring, playing second base, third base and shortstop, and has been impressive defensively. While he isn't a major threat with his bat, he did go 2 for 3 with a triple and a home run in his previous two games heading into Tuesday's action.
Jackson made a brief, seven-game appearance with the Cardinals last season while hitting .278/.352/.346 in 442 at-bats at Triple-A Memphis.
With the Braves rotation looking more and more like an infirmary, the team is going to have to rely on Teheran as a rock in the rotation every fifth day. He's playing the part beautifully in the spring, tossing nine scoreless innings over three appearances while striking out eight and walking one. He performed admirably in his first full season in the majors, going 14-8 with a 3.20 ERA, 1.17 WHIP and 170:45 K:BB ratio in 185 2/3 innings last year.